Ringing- regulator



J F. TOOMEY. 4

RINGING REGULATOR.

APPLICATION FILED SEPT. 17. 1918.

1,408,784. Patent d Mar 7, 1922.

IN VEN TOR.

ATTORNEY UNITED STATES JOHN F. TOOMEY, 03E NE JV YQRK, l.

TELEGRAPH COMEPA it CQBPORATIQN OF NEW YORK.

SSIGNOB TO AMERICAN TELEPHONE AND RI NGENG REGULATOR.

Application filed September To ail whom it may concern:

Be it known that T, Jenn F. Tooiiin', residing at New York, in the count of New certain Improvements in Ringing tors, of which the following is a tion.

This invention relates to ringing arr" c ments and particularly to arrangements for transmitting ringing current over transmis sion lines.

It has been found desirable, when ringing over certain types or lines, to have the ring ing continue for a certain interval oi time. A desirable interval for long distance lines has been found a practice to be approximately two seconds, although the interval may vary under different conditions. In former arrangements for ringing over long distance lines the ringing would only continue during the interval in which the operator held closed the ringing key. VJith such arrangements it has been found di'l icult to obtain a ringing interval which would be of satisfactory or uniform duration. Accordingly it is one of the objects of this invention to provide a means which will operate, when the ringing key is thrown, to insure the continuation of the ringing for satis factory and uniform interval of time. Other and further objects of this invention will be clear from the detailed description to be given later.

The ringing arrangements of this invention may be associated with either a cord circuit, a section of a transmission line which is composited for both telephone and tie graph service, or a section of a transmission line which is not so composited. There is associated with-the cord circuit or transmission line means which respond whene er the ringing key of the cord circuit is thrown or whenever a ringing impulse is transmitted over the line. Controlled initially by these responsive meansis a chain or series of slow releasing relays and means whereby ringing current is applied to the cord circuit or transmission line. When the ringing key of the cord circuit is released or when the operator ceases to transmit ringing current over the transmission line and these responsive means are released, the means for applying ringing current to the cord circuit or transmission line will remain held operative .bythe chain or series "of slow releasing re Specification of Letters Patent.

Patented Mar. *7, 1922.

Serial No. 254,493.

lays c ui'ng 'i that interval which elapses while the chair 1 0 series of slow releasing relays are releasing. By increasing or decreasing the number of slow releasing relays in this chain the ringing interval may be prolonged or shortened as desired.

in Fig. 1, the arrangements or. the invention are illustrated as adapted for use with the ringing apparatus of a line composited for both telephone and telegraph service. in Fig. 2 is illustrated a modification of the invention showing the arrangements as associated directly with a section of a transmis sion line.

in the Fig. l. is illustrated a composite-d transmission line, the section L of which terminates at switchboard apparatus and the section L, of which extends to a distant station. The s ctions L and L are interconnected by the repeating coil 17. Associated with the repeating coil 4-7 are the relays 416 and 4:9, the relay 48 being adapted to respond to the type of ringing current generated. at the switchboard apparatus and which in practice may have a frequency of 16 cycles. The relay a9 is adapted. to respond to the type of ringing current coming in over the section L which in practice may be of a frequency in the neighbor hood of 133 cycles. Under the control of relay 4-8 is the relay are which in turn c0I1- trols the operation of a series of slow re leasing relays such as the relays 413 and The relay 412 initially controls relays 46 and ill, which are in turn held operas tive by the relays 413 and 414. The relay l-G serves to connect the section L, of the line to the interrupter apparatus 415. The relay 411 serves to start the interrupter apparatus 415 into operation. The interrupter apparatus 415 serves to translate current from a local source into current having a frequency suitable for transmission over the section L of the line and which in practice might be in the neighborhood of 133 cycles. Under the control of relay 49 is the relay 410 which in turn controls the relay 45. The relay 45 serves to connect to the section L, of the line a source of ringing current suitable for operating the ringing apparatus at the switchboard, which in practlce might have a frequency in the ne1ghborhood of 16 cycles.

The operation of the arrangements illusiii.

trated in Fig. .i. is as follows: When the operator at the central ofiice or switchboard at which the section L of the line terminates starts her ringing apparatus into operation by depressing the key, or otherwise, ringing current will be transmitted over the sides of section L and over conductors 41 and 42, through the left hand windings of repeating coil 47 and through the winding of icla 48. As the relay 48 is adapted to respond to ringing currents suitable for use over section L it will be energized. The relay 49, however, is not adapted to respond to currentsof this type, and will not be energized. The operation of relay 48 will close the following circuit: from ground, contact 422, conductor 423, armature and contact of relay 48, conductor 424, windings of relay 412 to battery and ground. The closing of this circuit will energize relay 412 which, by pulling up its left hand armature, will close the following locking circuit: from ground, contact 427, conductor 426, lefthand armature of relay 412, contact 425, winding of relay 412, to battery and ground. The energization of relay 41.2 also closed the following circuit: from ground, armature of relay 412, contact 428, conductor 429 to connecting point 435. At this point the current will divide, one portion thereof being transmitted over conductor 436 and th winding of relay 46 to battery and ground. The other portion of the current will be transmitted from connecting point 435 over conductor, 433, winding of relay 411, to battery and ground. The closing of these circuits will energize the relays 46 and 411. The energization of relay -16 disconnects the sides of section L of the line from the conductors 43 and 44 and connects the sides of section L to the conductors 431 and 432 leading to the right-hand winding of transformer 438 of the interrupter ap )aratus 415. The energization of relay 411 causes the interrupter apparatus to function by completing the follo inc; circuit: from ground, lower armature and contact o" relay 411, conductors and 437, contact and armature of relay 441, winding of relay 441, lefthand winding of transformer 436, conductors 439 and 440 to source 416. Current from the source 416 will now be transmitted over this last mentioned circuit and willbe translated by the interrupter apparatus 415 into current having a frequency suitable for transmission over the section L of the line, which in practice may be of a frequency in the neighborhood of 133 cycles. This current will be transmittedv through transformer 438 V and over conductors 431 and 432 to the sides of the line L,. The energization of relay 411, by pulling up its upper armature, will close the following circuit: from ground, upper armature and-contact of relay 411, conductor. 419, winding of' relay 410, the battery and ground. The closing of this circuit will maintain the relay 410 in an energized condition and thereby prevent relay 45 which under its control from operating simultaneously with the relay 46. Upon the beforementioned energization of relay 412, the following circuit will. be closed: from ground, armature of relay 412, contact 442, winding of relay 413, to battery and ground. The closing of this circuit will energize the relay 413 which will pull up its armature and close the following circuit: from ground, armature of relay 41", contact 443, winding of relay 414, to battery and ground. The closing of this circuit will energize the relay 414 which will pull up its arnurture and connect a ground to conductor 431) and the circuits formerly closed through relays 46 and 411. The energization of relay 414 will at the same time open at contact point 427 the locking circuit formerly closed through the relay 412, thereby releasing the relay 412. The deenergization of relay 412 will open the circuit formerly closed through relays 46 and 411 at contact point 428 and the circuit through relays 46 and 411 will now be completed over conductor 430 and armature and contact of relay 414 as formerly pointed out. The deenergization of relay 412 will also open at contact point 442 the circuit closed through the relay 413. As the relay 413 is a slow releasing relay it will hold up its armature momentarily and will then release and will open at contact point 443 the circuit closed through the relay 414.. the relay 414 is a slow releasing relay, it will, hold up its armature momentarily 'ad upon releasing will open the circuit ...'rnerl ;x closed over conductor 430 about 46 and 41.1 and causing the transof ringing current out over the section 11 of the line to cease. It will be sec-n that after the operator at the switchboard with which the section L, of the line connected ceases to ring and the relays 48 and 412 are deenergized, ringing current will still be transmitted out over the section L of the line during the interval which elapses while the slow releasing relays 413 and 1414 are releasing. By adding to the circuit additional slow releasing relays simiar to the relays 413 and 414, this ringing interval may be prolonged if desired.

The ringing current coming in over the section L, of the line will be transmitted over conductors 43 and 44 through the right hand windings of repeating coil 47 and through the windings of relay 49. As the relay 49 is adapted to respond to ringing current of this type, it will be energized. The relay 48 however, will not be energized, it is not adapted to respond to currents of this type. The operation of relay 49 will open the following normally closed circuit at contact point 444: from ground, armature of relay 49, contact point 444, conductors 413 and 119, winding of relay 410, to battery and ground. The opening of this circuit will deenergize relay 410 which will allow its armature to retract and thereby close the following circuit: from ground, contact point 420, conductor 421, winding of relay to battery and ground. The closing of this circuit will energize the relay 45 which will disconnect the sides of section L, of the line from conductors 41 and 42, and

will connect to the section L, of the line a local source 417 of ringing current suitable for operating the ringing apparatus located at the switchboard which ringing current may in practice have a frequency in the neighborhood of 16 cycles.

In the Fig. 2 is illustrated a transmission line L, across which is bridged a relay 51 which is adapted to respond whenever an impulse of ringing current is transmitted over the line L Under the control of relay 51 is the relay 53 which in turn controls the operation of the relay 54, whercl y a local source of ringing current may be connected to another section of the line L, over which it is desired to ring. Under the control of relay 53 is the slow releasing relay 512 Which in turn controls the slow releasing relay 514. The slow releasing relay 514 also serves to control the relay 54.

The operation of the arrangement illus trated in ll 2 is as follows: Then a ringing impulse is transmitted over the line L the relay 51 responds and by pulling up its armature closes the following circuit: from ground, armature and contact of relay 51, conductor 52, winding of relay 53 to battery and ground. This energizes the relay 53 and closes the tollowing locking circuit therefor; from ground, contact 57, conductor 56, armature of relay 53, contact 55, winding of relay 53, to battery and ground. The energization of relay 53 also serves to close the following circuit. From ground, armature of relay 53, contact 58, conductors 59 and 520, winding of relay 54 to battery and ground. The closing of this circuit energizes the relay 54 which connects a section or' the transmission line over which it is desired to ring to a local source of ringing current 521. Ringing current from the source 521 will be transmitted out over the line as long as the relay 54 is maintained in an energized condition. The energization of relay 53 also closes the following circuit: from ground, armature of relay 53, contact 510, conductor 511, winding of relay 512, to battery and ground. The energization of relay 512 closes the following circuit: from ground, armature and contact of relay 512, conductor 513, winding of relay 514, to battery and ground. The energization of relay 514 serves to open at contact point 57 the locked circuit formerly closed through the relay 53, thereby deenergizing the relay 33. The energization of relay 514, however, serves to apply a ground to conductor 515 and thence to conductor 520, thereby maintaining the circuit through the relay On the deenergization of relay 53 the circuit formerly closed through relay 54 is now broken at contact point 58 and the circuit through relay 54 is completed over conductor 515 and contact 516 as formerly pointed out; and the circuit formerly closed through the relay 512 is now broken at contact point 510. The breaking of this last mentioned circuit (leenergizes the relay 512. As the relay 512 is a slow releasing relay it will momentarily hold up its armature and then release and open the circuit formerly closed through the relay 514, thereby deenergizing relay 514. As the relay 514 is also a slow releasing relay, it will momentarily hold up its armature and will then release and will open at contact point 516 the circuit formerly closed through the relay 54, thereby releasing the relay 54 and causing the transmission of ringing current over the line to cease. It will be seen that the relay 54 will be energized and ringing current will be transmitted over the line during that interval, after the cessation of the original ringing impluse, which elapses while the slow releasing relays 512 and 514 are releas ing. By increasing or decreasing the number of slow releasing relays, such as the relays 512 and 514, the ringing interval may be prolonged or shortened, as desired.

While the invention has been disclosed as embodied in certain specific arrangements which are deemed desirable, it will be understood that it is capable of embodiment in many and widely varied forms without departing from the spirit of the invention as defined in the appended claims.

What is claimed is:

1. A transmission line, means associated therewith responsive to alternating ringing currents transmitted over one section of said line, a chain of slow releasing relays initially controlled by said responsive means and controlling each other in sequence, means controlled by said chain of relays, when operated, to dis-associate said chain from said responsive means, a source of ringing cur rent, and means controlled by said. chain of relays to apply current from said source to another portion of said line.

2. A. transmission line including two line sections, means associated with one of said line sections responsive to alternating ringing current transmitted over said line sec tion, a chain of slow releasing relays initially controlled by said responsive means and controlling each other in sequence, means controlled by said chain of relays, when operated, to disassociate said chain from said responsive means, a source of alternating ringing current suitable for transmission over said other line section, and means iontrolled by said chain of" relays until all of said relays have released to apply current from said last mentioned source to said last mentioned line section.

3. A transmission line, a relay associated with one section of said line and responsive to currents suitable for transmission over" second mentioned line SQl'tlOll. means con trolled by said second relay for applying current from said first mentioned source over said first line section a chain of slow releasing relays initially controlled by said first mentioned relay, means controlled by said chain of relays for applying current from said second source to said second mentioned line section, and means controlled by said chain of relays for preventing current from said first mentioned source from being simultaneously applied to said first mentioned. line section.

In testimony whereof, I have signed my name to this specification this thirteenth day of September, 1918.

JOHN F. TOOMEYM 

